Georgia Gas Fitter Examination
Advanced Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
Q1. A natural-gas piping system is being designed for a building with several
appliances. Which factor is most important when determining the required pipe
size?
A. The exterior color of the pipe
B. The total developed length and connected appliance demand
C. The age of the building
D. The number of electrical circuits
Answer: B. The total developed length and connected appliance demand
Rationale: Proper gas-pipe sizing accounts for the developed length of the
piping run and the combined demand of appliances served. Undersizing can
cause excessive pressure drop and improper appliance operation.
Q2. A gas fitter installs a new branch line to a 100,000 Btu/h appliance. Before
selecting the pipe diameter, what information should be established?
,A. Appliance input rating and allowable pressure drop
B. Appliance paint color
C. Electrical breaker size only
D. Roof pitch
Answer: A. Appliance input rating and allowable pressure drop
Rationale: Gas-piping sizing depends on the appliance demand, system pressure,
pipe material, developed length, and allowable pressure loss.
Q3. What is the primary purpose of a gas pressure regulator?
A. Increase combustion temperature
B. Reduce and control gas pressure to an appropriate downstream level
C. Remove carbon monoxide
D. Increase gas volume indefinitely
Answer: B. Reduce and control gas pressure to an appropriate downstream level
Rationale: Regulators control gas pressure so downstream piping and
appliances receive gas within their required operating range.
Q4. A regulator is installed indoors where venting is required. What is the
principal concern when selecting the regulator installation arrangement?
A. Decorative appearance
B. Proper venting and prevention of hazardous gas accumulation
C. Distance from electrical switches only
D. Pipe color
Answer: B. Proper venting and prevention of hazardous gas accumulation
Rationale: Regulator venting must be arranged according to the applicable code
and manufacturer requirements to prevent unsafe gas release or pressure-
control problems.
Q5. A gas appliance repeatedly produces yellow, unstable flames instead of a
predominantly blue flame. What should the gas fitter investigate first?
,A. Possible inadequate combustion air or improper gas-air mixture
B. The appliance's electrical outlet color
C. The water supply pressure
D. The thermostat battery only
Answer: A. Possible inadequate combustion air or improper gas-air mixture
Rationale: Abnormal flame characteristics can indicate incomplete combustion
caused by insufficient air, incorrect pressure, blocked burners, or other
combustion problems.
Q6. Why must a gas appliance have adequate combustion air?
A. To reduce the electrical load
B. To provide oxygen necessary for proper combustion
C. To increase water pressure
D. To prevent pipe corrosion exclusively
Answer: B. To provide oxygen necessary for proper combustion
Rationale: Gas combustion requires sufficient oxygen. Inadequate combustion
air can produce incomplete combustion and dangerous carbon monoxide.
Q7. A technician discovers a gas leak at a threaded connection during testing.
What is the appropriate response?
A. Ignore it if the leak is small
B. Correct the connection and retest the system
C. Cover it with paint
D. Increase gas pressure to seal it
Answer: B. Correct the connection and retest the system
Rationale: Any detected gas leakage must be corrected. The system should then
be retested using an approved procedure before being placed into service.
Q8. Which method is generally inappropriate for locating a gas leak?
, A. Approved leak-detection solution
B. Instrument designed for gas detection
C. Open flame
D. Approved testing equipment
Answer: C. Open flame
Rationale: An open flame can ignite accumulated gas and cause fire or
explosion. Leak detection must be performed using approved methods.
Q9. A gas fitter is pressure-testing a newly installed piping system. What is the
purpose of the test?
A. Determine the pipe's color
B. Verify the piping system is sufficiently gas-tight
C. Measure water flow
D. Increase appliance efficiency
Answer: B. Verify the piping system is sufficiently gas-tight
Rationale: Pressure testing is intended to demonstrate that the installed piping
is free from unacceptable leakage before gas service is placed into operation.
Q10. Why should appliance gas controls generally be protected from excessive
test pressure?
A. Excessive pressure can damage appliance components
B. It makes the appliance quieter
C. It increases pipe length
D. It prevents combustion air from entering
Answer: A. Excessive pressure can damage appliance components
Rationale: Appliance controls and regulators may not be designed to withstand
the pressure used to test building piping. They must be isolated or protected as
required by the applicable procedure.
Advanced Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
Q1. A natural-gas piping system is being designed for a building with several
appliances. Which factor is most important when determining the required pipe
size?
A. The exterior color of the pipe
B. The total developed length and connected appliance demand
C. The age of the building
D. The number of electrical circuits
Answer: B. The total developed length and connected appliance demand
Rationale: Proper gas-pipe sizing accounts for the developed length of the
piping run and the combined demand of appliances served. Undersizing can
cause excessive pressure drop and improper appliance operation.
Q2. A gas fitter installs a new branch line to a 100,000 Btu/h appliance. Before
selecting the pipe diameter, what information should be established?
,A. Appliance input rating and allowable pressure drop
B. Appliance paint color
C. Electrical breaker size only
D. Roof pitch
Answer: A. Appliance input rating and allowable pressure drop
Rationale: Gas-piping sizing depends on the appliance demand, system pressure,
pipe material, developed length, and allowable pressure loss.
Q3. What is the primary purpose of a gas pressure regulator?
A. Increase combustion temperature
B. Reduce and control gas pressure to an appropriate downstream level
C. Remove carbon monoxide
D. Increase gas volume indefinitely
Answer: B. Reduce and control gas pressure to an appropriate downstream level
Rationale: Regulators control gas pressure so downstream piping and
appliances receive gas within their required operating range.
Q4. A regulator is installed indoors where venting is required. What is the
principal concern when selecting the regulator installation arrangement?
A. Decorative appearance
B. Proper venting and prevention of hazardous gas accumulation
C. Distance from electrical switches only
D. Pipe color
Answer: B. Proper venting and prevention of hazardous gas accumulation
Rationale: Regulator venting must be arranged according to the applicable code
and manufacturer requirements to prevent unsafe gas release or pressure-
control problems.
Q5. A gas appliance repeatedly produces yellow, unstable flames instead of a
predominantly blue flame. What should the gas fitter investigate first?
,A. Possible inadequate combustion air or improper gas-air mixture
B. The appliance's electrical outlet color
C. The water supply pressure
D. The thermostat battery only
Answer: A. Possible inadequate combustion air or improper gas-air mixture
Rationale: Abnormal flame characteristics can indicate incomplete combustion
caused by insufficient air, incorrect pressure, blocked burners, or other
combustion problems.
Q6. Why must a gas appliance have adequate combustion air?
A. To reduce the electrical load
B. To provide oxygen necessary for proper combustion
C. To increase water pressure
D. To prevent pipe corrosion exclusively
Answer: B. To provide oxygen necessary for proper combustion
Rationale: Gas combustion requires sufficient oxygen. Inadequate combustion
air can produce incomplete combustion and dangerous carbon monoxide.
Q7. A technician discovers a gas leak at a threaded connection during testing.
What is the appropriate response?
A. Ignore it if the leak is small
B. Correct the connection and retest the system
C. Cover it with paint
D. Increase gas pressure to seal it
Answer: B. Correct the connection and retest the system
Rationale: Any detected gas leakage must be corrected. The system should then
be retested using an approved procedure before being placed into service.
Q8. Which method is generally inappropriate for locating a gas leak?
, A. Approved leak-detection solution
B. Instrument designed for gas detection
C. Open flame
D. Approved testing equipment
Answer: C. Open flame
Rationale: An open flame can ignite accumulated gas and cause fire or
explosion. Leak detection must be performed using approved methods.
Q9. A gas fitter is pressure-testing a newly installed piping system. What is the
purpose of the test?
A. Determine the pipe's color
B. Verify the piping system is sufficiently gas-tight
C. Measure water flow
D. Increase appliance efficiency
Answer: B. Verify the piping system is sufficiently gas-tight
Rationale: Pressure testing is intended to demonstrate that the installed piping
is free from unacceptable leakage before gas service is placed into operation.
Q10. Why should appliance gas controls generally be protected from excessive
test pressure?
A. Excessive pressure can damage appliance components
B. It makes the appliance quieter
C. It increases pipe length
D. It prevents combustion air from entering
Answer: A. Excessive pressure can damage appliance components
Rationale: Appliance controls and regulators may not be designed to withstand
the pressure used to test building piping. They must be isolated or protected as
required by the applicable procedure.
